if i try a cpu card from another machine it works.
I think you've found the problem...
Is the cpu card totally dead?
Dunno.. Its a FADAL!!! Power supply and voltages... Stuff gets old,
capacitors get a little cranky..
What power supply do you have in the machine?? What are your voltages???
That new power supply they've been selling for about 3 or 4 years, the one that
DOESN'T look like (and is) a PC power supply cures a lot of ills...
Here is a low voltage situation.. And it was SOOOOO Touchy.. If it fired up
at 11.86V, the machine would work.. 11.84, and the screen was blank. 11.85V and
I got garbage, and the garbage was always different.
One thing you could do.. Put your original CPU card back in, and then pull all
the cards that aren't attached to it... Leave the main 3 that are bridged.
You don't have to pull the OUT, just pull them out an inch so that they aren't
connected.
*********PUSH IN THE E-STOP..*****************
fire it up and see what happens.. That will eliminate all
the tiny voltage drains of the other cards, and let you know if your "bad" card is
still functional.. If your "bad" card itself isn't the culprit.
Check your voltages while you are doing this.